"All ships may be built in shipyard space stations if the ship is the length of the station or smaller (doesn't apply to stations 3km or larger). Factories and factory stations are limited to ships less than 80 metres in length."

Just like any other ship but it will have to be in a shipyard 1800 metres or longer in length. Which rules out all but a SY IV.

The "how" of production is described in the rules page I linked above. If this is your first time manufacturing, I strongly recommend you get with a manufacturing faction who will step you through the process.

Thanks. How to construct SY IV which requires 360Kt more RMs? Does it need having all required RMs in the same square to build station? Only two ships, Lucrehulk-class Battleship and Mammoth-class Heavy Hauler, can hold that many RMs. It's not about gameplay, but rules.